
EW has an interview with Nina Dobrev.
You can read the entire interview here.
Here is an excerpt from the interview:
EW: Did you read the Vampire Diaries books?
NINA DOBREV: I have read the first three books. I’ve been told not to read any further because the creator, Kevin [Williamson], asked us to get the feel for it, read the first couple, but then he wants us to take our own interpretation. My character especially has been changed the most out of anyone because, on a superficial level, I’m not blond and blue-eyed. But other than that, my character, they made her a little more relatable and a little more vulnerable, because they want the audience to feel and relate to her, whereas in the book, she has a little harder edge. She’s a little bit more of a mean girl.